mail quarantine Reference user portal - Blocking clients

Hello,

We allow our users to release their quarantined mails via portal through (Email > Quarantine settings >  Release link settings) which is WAN link. 
We are getting some random failed  logins from a specified source, I know (Administration > Admin and user settings > Login security ) blocks the source ip after failed login attempts for a set period but,  Is there a way to block that source indefinitely ?  



Edited TAGs
[edited by: Raphael Alganes at 2:25 PM (GMT -7) on 30 Jul 2025]